Pet litter box

A pet litter box (1) comprising:

• a base element (10) having a support surface (11) for a pet,
• an absorbent mat (20) laid on the base element (10),
• a bowl-shaped open-top frame (30) removably mounted on the base element (10),
• wherein the frame (30) comprises:
• a bottom wall (31) associated with the base element (10) having the absorbent mat (20) thereon, the bottom wall (31) having a central opening (32) positioned so as to entirely overlap at least one portion (21) of the absorbent mat (20), the opening (32) being delimited by an interior peripheral edge (45) joining the bottom wall (31) with the absorbent mat (20),
• at least one side wall (35) extending vertically from the bottom wall (31) to define an entrance (33) for a pet into the at least one portion (21) of the absorbent mat (20), the at least one portion (21) of the absorbent mat (20) is directly exposed from within the opening (32) and directly accessible by the pet,
• the entrance (33) is a lateral entrance configured to allow a pet to access to the at least one portion (21) of the absorbent mat (20) from a side of the bottom wall (31),
• the interior peripheral edge (45) has a thickness (dl) continuously and gradually decreasing thereby defining a curved conveying surface (45a) extending from the bottom wall (31) towards the absorbent mat (20) at an angle relative to a direction perpendicular to the base element (10), thereby conveying urine from the bottom wall (31) towards the absorbent mat (20),
• the at least one side wall (35, 36, 37) being connected to the bottom wall (31) via a respective connection area (40, 41, 42) having a concave shape with its incurved surface facing towards the opening (32) of the bottom wall (31), thereby a continuously and gradually decreasing conveying surface (40a, 41a, 42a) countersinking or tapering from the respective side wall (35, 36, 37) towards the bottom wall (31) and having a concave shape with the incurved surface opposed with respect to the convexed surface of the curved conveying surface (45a) for allowing urine to flow from the at least on side wall (35, 36, 37) to the absorbent mat (20).